ML20093D389
| ML20093D389 | |
| Person / Time | |
|---|---|
| Site: | Bellefonte  |
| Issue date: | 09/19/1984 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| NUDOCS 8410110227 | |
| Download: ML20093D389 (2) | |
Text
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TENNESSEE VALLEY AUTHORITY.
4 CHATTANOOGA, TENNESSEE 37401
'400 Chestnut Street Tower II 1
September 19; 1984 34 $[p 24 p l.
L BLRD-50-438/84,,
BLRD-50-439/84 U.S. Nuclear Regulatory Commission
- Region II :
Attn:
Mr. James P;.0'Reilly, Regional Administrator 101 Marietta Street, NW,- Suite 2900 Atlanta,' Georgia -30323
Dear.Mr. 0'Reilly:
BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 - POTENTIAL FOR COOLER FAN FAILURE DUE TO' 1 UNDERSIZED THERMAL OVERLOAD RELAY: HEATER ELEMENTS - BLRD-50-438/84-47, BLRD-50 439/84 FIRST INTERIM REPORT The. subject deficiency was initially reported to NRC-0IE Inspector P. E. Fredrickson on August 21, 1984 in accordance with 10 CFR 50.55(e) as NCR BLN EEB 8417. Enclosed is.our first interim report. We expect to submit our.next report on or about March 15, 1985.
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-If you have any. questions, please get in touch with R. H. Shell at FTS 858-2688.
Very truly yours,
- TENNESSEE VALLEY AUTHORITY L. M. Mills, Manager
_ Nuclear Licensing Enclosure cc:
Mr. Richard C. DeYoung, Director (Enclosure)
Office of Inspection and Enforcement i
U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Records Center (Enclosure)
Institute of. Nuclear Power Operations 4
1100 Circle 75 Parkway, Suite 1500 a
- Atlanta, Georgia 30339
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A-0 438 PDR An Equal Opportunity Employer
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_ ENCLOSURE BELLEFONTE NUCLEAR PLANT UNITS 1 AND 2 POTENTIAL FOR COOLER FAN FAILURE DUE TO UNDERSIZED THERMAL OVERLOAD RELAY HEATER ELEMENTS BLRD-50-438/84-47, BLRD-50-439/84-43 10 CFR 50.55(e)
NCR BLN EEB 8417 FIRST INTERIM REPORT j
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Description of Deficiency In nonconformance report (NCR) WBN NEB 8408 (WBRD-50-390/84-35, WBRD-50-391/84-31), TVA identified a deficiency at Watts Bar Nuclear Plant (WBN) in which three engineered safety feature (ESP) cooler fan motors failed to start during preoperational test W-3.1F (integrated safety injection (SI) and station blackout). The failure to start was attributed to in-line thermal overload relays which had tripped. This condition had previously occurred at WBN on preoperational test - TVA-9C. The probable cause of these failures has been attributed to undersized thermal overload relay heater elements.
Since Bellefonte Nuclear Plant (BLN) uses the same motor control center (MCC) vendor (ITT-Gould) and uses the same vendor sizing criteria, there exists a potential for the same problem to occur at BLN.
Interim Progress TVA is performing a design study to identify all heating, ventilating, and air-conditioning loads on shutdown boards at BLN. An evaluation of the thermal overload relay heater element sizing for the identified loads will be performed.
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